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Yes, they will share their cookies. So if you use these "Good Cookies" (sic) to store your session key you will have some huge troubles with corporate proxies and also 3G connections since a lot of mobile ISP transparently proxy HTTP and that a lot of people use the same mobile browsers.

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Why would you store your session key with this? It's not meant for first-party domains.

Ironically, it's probably at least as useless for third-party trackers.

Here [advertiser], here's statistics that could correlate to a user, or to a group of users at a conference, or to a group of random people at a coffee shop or some disjoint group of people sharing wifi at an apartment complex. Sorta defeats the point of tracking.

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